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The necessary formula for engineering student! (Engineering Law)
Ohm's Law
In 1826, the German scientist Dr. George Simon identified the relationship between the currents, voltage and resistance, this relationship is known as the formula of ohms.
The current is proportional to the voltage of the condensation of the conductor, which is flowing through a conductor of balanced voltage.
Or
The current flowing at a constant temperature through any conveyance is equivalent to the difference difference between the two ends and the resonance is inversely proportional.
According to the OM source, if the voltage difference between the two ends of a conductor is V and the current I is flowing,
V α I
Or, V = IR here, R = resin of resin (proportional constant)
Limit of OM's formula:
Although the formula of ohms is believed to be the guru of the electric power, there are some limitations
- The formula of ohm is applicable for DC, not AC.
- Ohm's formula does not apply if the temperature changes.
- Although the temperature is stable, the formula of ohms is not applicable for silicon carbide.
- Complex circuits can not be solved by the formula of ohm.
Farad's Law of Electrolysis
The famous scientist Michael Faraday invented two sources of electrodynamics.
First Formula:
In the electrolysis process, proportional to the amount of electricity deposited on the electrode, the amount of electricity, or the amount of electricity flowing through the electrolyte.
Second source:
The amount of substances stored on the electrodes in the electrolysis process is proportional to their electrical equilibrium.
Charge amount q
Flowing current i
The current flow time and t
If the electrochemical equivalent is Z,
According to the first formula, m α q
According to the second source, m α Z
Lenz's law
The source of Lenz is an easy way to understand how the electrical magnetic circuit complies with the Newton's 3rd source and energy conservation source. Lenz's form has been named after Henrik Lennz. It is said
An induced electromagnetic force always increases the electrode, whose magnetic field opposes the actual magnetic flux.
Lanez's formula gives the negative indication of the failure of the formaldehyde
\ mathcal {E} = - \ frac {\ partial \ Phi_ \ mathrm {B}} {\ partial t}
This implies that there is an opposite sign between induced electrochemical force (ℰ) and magnetic flux (∂ΦB).
Thevenin Theorem
E.m.f. A load resonance connected to two points of a complex network consisting of multiple sources and resinsensants will be the same, if the load is eMF. It is connected to a single fixed source. Whose e.m.f. The load parallel is similar to the opaired circuit voltage and whose internal resistance is equal to the reverse side of the network resistor from the two edges. E.m.f. Its sources will be replaced by their equivalent internal resistance.
Superposition Theorem
On a linear bilaterals network, in a current flowing through a point or two points, the EMF Due to the multiple sources of this, the different triggers in those points or points, or the EMF. The algebraic sum of the differences will be the same if each source is considered separately and the conversion of each of the other sources into an internal resistor.
Kirchhoff's Law
Kirchhoff's Current Law:
The algebraic sum of the current combined at a point in a circuit is equal.
Kirchhoff's Law
Kirchhoff's Current Law:
The algebraic sum of the current combined at a point in a circuit is equal.
Or
The incoming current and emitted current at a point in a circuit is equal.
Kirchhoff's Voltage Law:
All the EMFs on a closed electric network and all voltage drops are zero algebraic sum.
Coulomb's Law
First Formula:
The same charges incur one another and attract the opposite religious charges.
Second source:
The attraction or infusion of two points charge is proportional to the quantity of the charge two, and the interceptor of the distance between them is the proportional.
When the distance between two points is Q1 and Q2, respectively, when the distance between them is d,
Ball F α Q1Q2 / d2
Or, F = k F α Q1Q2 / d2 here, K = 9X109 [constant]
Ampere's Law
A mathematical scholar of France, Aadre Marie, discovered the formula of the two conductor ball valve formulas. This formula is named after his name.
In the transient two parallel conductives, the length of the working force conductive between two and the proportion of the distance between the two proportional and conductive products of the current output is interrupted.
If the functional force F, current I1 and I2, the length of the conductive two, the distance between L and conductive r is r,
However, F α I1I2L / r
Or, F = 2X10-7I1I2L / R here, 2x10-7 = proportional constant
Fleming's Left Hand Rule
If the left-hand thumb, index finger and medium are expanded in the right angle, the index finger indicates the direction of the conductive wire in the direction of the index finger and the direction of the middle finger.
This formula helps in the rotation of the motile rotation.
Maxwell Cork Screw Rule
British physicist James Clark Maxwell introduced the sources of calculator ballpoint in 1873 with the help of Cork-Str.
Wherever the current is flowing, the cork-screw in the right hand towards the direction of which the currents flow, the direction of the magnet will point to where the thumb turns.
Ampere's Swimming Rule
If a person swims on the conductor in such a way that the person carrying his face in the compass magnets near the conductor, through which the left hand of that person will be stretched, the north pole of the compass magnifier will show distraction, ie the magnet direction Will be
Right Hand Rule
When folding the wire with the right arm with the right hand left on the current flow, its enclosing fingers will point the direction of the circular force round the wire.
Joules Law
In 1841, English scientist Dr. James Prescott invented a formula for Jules Heath, which is known as the source of the Jules.
If the heat is released to H, the current I, the resistance to R and the time is written, but can be written in mathematical terms. - H α I2, when R and t constant
- H α R, when I and t are constant
- H α t, when I and R are constant
Therefore, H α I2Rt
Or H = I2RT / J, J = 4200 z / kilo calorie mechanical equivalent of heat (proportional constant)
Resistance Law
At a specific temperature, the resistance of a conductor's resistances is proportional to the length, the width is dependent and its resistance depends on relative resistance to the conductive material.
Registry R, the area of intersection A and length L,
R α L / A
Or, R = ρL / a here, ρ = special resistance (constant constant)
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